Stupid 302 redirect question.
lazarus / 38-Networking and Web Programming

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jamie · 2019-06-29 16:19

So I am using some old Delphi (ICS) ThttpCli class for some basic web
cam image fetching...

I have a couple of test addresses that work in the browser but comes
in the header as a
302 redirect and gives the new location to use..

The problem is that the location given is the same as the one I
originally requested so if I were to
update the URL property with the new location URL and do another
HeadAsync it just comes back with the
same thing so for now I just simply test the current URL with the
Location url and if they are the same I
then Abort the attempt.

 The only thing I can come up with as an issue that it could be is the
fact that the url is a HTTPS and
looks like I need to have a SSL connection active, is this the case?

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lucamar · 2019-06-29 16:34

Difficult to say without the request and the reponse, but it's very
probable.

If your request asks for an http URI, it may possibly come back with a
redirect to the same URI but with an https protocol.

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Remy Lebeau · 2019-07-03 03:38

Quote from: jamie on June 29, 2019, 06:19:47 pmThe problem is that the
location given is the same as the one I originally requested

Is it EXACTLY the same?  Slashes and query params and everything?

I've seen cases where a URL redirects back to itself with a trailing
slash included if one was missing in the original request.

On the other hand, if the redirect URL is EXACTLY the same as the
original URL, then the only time I've ever seen that happen is when
the original request was missing a cookie that the URL requires, so it
redirects back to itself with a new cookie included in the redirect
response so it can be sent back in the next request.

Quote from: jamie on June 29, 2019, 06:19:47 pmThe only thing I can
come up with as an issue that it could be is the fact that the url is
a HTTPS and looks like I need to have a SSL connection active, is this
the case?

Is the URL scheme/port number changing in the redirect?  Upgrading a
request from HTTP to HTTPS is another common use of a redirect.  That
would require dropping the current connection on the old port and
reconnecting on the new port so an SSL/TLS handshake can then be
performed.